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Agence France-Presse

Time to raise a glass to better gut health?
Scientists at King’s College London have found that red wine drinkers have a greater diversity of bacteria in their digestive tracts – a marker of gastrointestinal well-being – than those who drink other alcohol.
Their paper, published in the journal Gastroenterology on Wednesday, explored the effects of beer, cider, wine and spirits on the population of microorganisms in the gut – the microbiome – and other health indicators in 916 female twins in the UK.
Drinking red wine was linked to the greatest positive impact on gut health – and was also associated with lower levels of obesity and “bad” cholesterol. There were no such associations for beer, cider or spirits, but a minor effect linked to white wine.

Lead author Caroline Le Roy said that while there had been some previous research on animals and laboratory experiments that showed red wine expanded gut microbiota, there had never been a large human study.
“The more diversity there is, the better it is for us in some ways. You will be more able to fight disease and produce more metabolites from food,” she said.
An imbalance between “good” and “bad” microbes can lead to adverse outcomes including reduced immunity, weight gain and high cholesterol.
The team even noted a slight reduction in the hormone insulin, but suspect that effect is not mediated by the gut microbiota and something else may be at play.
One of the major drawbacks of so-called “association” studies based on observations about populations is that they do not demonstrate causation, and a one-off finding that appears to show a positive correlation can be the result of luck.

The higher standard randomised clinical trials, in which researchers closely control the inputs given to subjects, are generally used to test new medicine, but rarely applied to studies related to human diet, partly because of ethical concerns.
The researchers therefore tested and replicated their findings in two more groups – in the US and in the Netherlands – each of about 1,000 people, and a final set of twins in Britain.
Recruiting twins had the benefit of removing potential outside factors (known as “confounders”) such as genetic predisposition and early socioeconomic background.

The team suspect polyphenols, micronutrients found in grape skin, were responsible for the greater diversity of gut microbiota.
That conclusion is seemingly supported by the fact that white wine was also linked to a positive association with microbiota diversity, although to a far lesser extent.
White wine has similar alcohol content to red, but with a concentration of polyphenols six to seven times lower.
Potentially drinking one glass of red wine every two weeks is enough to have a beneficial effect, which is quite a good message because obviously alcohol is still bad for us
Caroline Le Roy
Nik Sharma, a neuroscientist at University College London, who was not involved with the work, said that more research is still required, “perhaps using mouse models to establish the nature of the relationship and to further explore the underlying mechanisms”.
Still, he said “the work is robust” and the use of twins added weight to its conclusions, as did the replication of its findings across other groups.
While that might seem positive, Le Roy urged people to avoid hitting the bottle, especially if they are non-drinkers.

Alcohol is responsible for more than 200 medical conditions, according to the World Health Organisation, from mental and behavioural disorders to liver cirrhosis, some cancers and heart disease.
“Potentially drinking one glass of red wine every two weeks is enough to have a beneficial effect, which is quite a good message because obviously alcohol is still bad for us,” said Le Roy, adding that some fruits, vegetables, nuts and even chocolate are also rich in polyphenols.
Blueberries and red onions are among these healthier alternatives.
“You don’t have to drink red wine, and you don’t have to start drinking red wine if you don’t drink it,” she concluded.


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Lifestyle

Health & Wellness

Food & Drink


Red wine drinkers have been found to have a greater diversity of bacteria in their guts – a sign of good health – than those who drink other forms of alcohol
Researchers tested groups of 1,000 twins in the US, the Netherlands and the UK



Red wine drinkers have been found to have a greater diversity of bacteria in their guts – a sign of good health – than those who drink other forms of alcohol.


Wine and Spirits

Disease

World Health Organization (WHO)

A reason to drink red wine: it is good for gut health, and lowers obesity and bad cholesterol, study finds

Red wine drinkers have been found to have a greater diversity of bacteria in their guts – a sign of good health – than those who drink other forms of alcohol Researchers tested groups of 1,000 twins in the US, the Netherlands and the UK

Red wine drinkers have been found to have a greater diversity of bacteria in their guts – a sign of good health – than those who drink other forms of alcohol

Researchers tested groups of 1,000 twins in the US, the Netherlands and the UK